View Single Post
Old 12-13-2010, 07:19 PM   #2  
Twin Wasp
Gets Weekends Off
 
Twin Wasp's Avatar
 
Joined APC: Oct 2007
Position: Sr. VP of button pushing
Posts: 2,546
Default

This is probably overkill. At least read the bottom couple lines. Adequate Visual Ref will only get you down to 1600 RVR:

c. Lower Than Standard Takeoff Minima. When takeoff minima are equal to or less than the applicable standard takeoff minima, the certificate holder is authorized to use the lower than standard takeoff minima described in this operations specification.
d. TDZ RVR 1600 (500m) (beginning of takeoff roll) or visibility or Runway Visibility Value (RVV) statute mile, provided one of the following visual aids listed in d.(1) (4) is available:
(1) High intensity runway lights (HIRL).
(2) Operative runway centerline (CL) lights.
(3) Serviceable runway centerline marking (RCLM).
(4) In circumstances when none of the above visual aids are available, visibility or RVV statute mile may still be used, provided other runway markings or runway lighting provide pilots with adequate visual reference to continuously identify the takeoff surface and maintain directional control throughout the takeoff roll.
So if the HIRL, the CLs and the RCLM are all unusabled, but you think you can see enough to keep it on the runway, you're good to go down to 1600.

1) TDZ RVR 1200 (350m) (beginning of takeoff roll), mid-RVR 1200 (350m) (if installed) and
rollout RVR 1000 (300m), if authorized, may be used provided RVR equipment and one of the following visual aids combinations are available:
(a) Daylight Hours. Serviceable RCLM or HIRL or operative CL lights.
(b) Night Time Hours. HIRL or operative runway CL lights.

To get down to 12/12/10you're going to need something beyond just "adequate visual ref." And you're going to need lights at night.

(2) TDZ RVR 1000 (300m) (beginning of takeoff roll), mid-RVR 1000 (300m) (if installed) and
rollout RVR 1000 (300m), if authorized, may be used provided RVR equipment and one of the following visual aids combinations are available:
(a) Operative runway CL lights, OR
(b) HIRL and serviceable RCLM.

For 10/10/10 you need something to keep on the centerline.

(3) TDZ RVR 600 (175m) (beginning of takeoff roll), mid-RVR 600 (175m) (if installed), and rollout RVR 600 (175m), or TDZ RVR 500 (150m) (beginning of takeoff roll), mid-RVR 500 (150m) (if installed), and rollout RVR 500 (150m), if authorized, may be used provided RVR equipment and ALL of the following visual aids are available.
(a) HIRL.
(b) Operative runway CL lights.

For 5/5/5 you need lights both on the centerline and edge.

Get a Jepp chart for someplace like DFW and it will break it down beyond adequate visual ref. So if their Ops Specs allow it and it just says adequate visual ref, you're good down to a 1/4 mile or RVR 1600.
Twin Wasp is offline